Diesel Emissions Fluid Injector Nozzle: Service and Repair

Reducing Agent Injector N474

• The "NOx reducing agent AUS 32" (AdBlue(R)) is simply called reducing agent in the following information.

• The reducing agent can irritate skin, eyes and the respiratory system.

• If the fluid comes into contact with skin, rinse the affected area immediately with plenty of water.

• If necessary, consult a physician.

Protect the connectors, for example with a plastic bag or cable ties, before they become coated with reducing agent. The connectors could be damaged because the reducing agent has a tendency to seep and it crystallizes.

Seal all openings on the line and the connections immediately with plugs to prevent contaminants from entering. Even tiny particles can cause serious damage to the system.

Make sure the reducing agent does not come into contact with clothing or the vehicle body.

If this occurs, wash immediately with clean water and then dry with a lint-free cotton cloth.

If the reducing agent has already crystallized, use warm water and a sponge.

Reducing agent that is not removed will crystallize and can damage the affected surface.

Removing

- Release and disconnect the connector - 4 - on the reducing agent injector - 2 -.






- Release the circlip - 3 - in the - direction of arrow 1 -.

- Remove the coupling in the - direction of arrow 2 - without special tools and without sharply pulling on it.

- Open the clamp - 1 - and remove the reducing agent injector.

Installing

Install in reverse order of removal. When doing this note the following:

- Position the reducing agent injector with a new seal on the NOx reduction catalytic converter and make sure the tabs are positioned correctly.

Electric connector faces up

- Lay a new clamp over the connection and press it together until it locks. This secures the reducing agent injector.

- Position the bolt and tighten it.

- Connect the electrical wire first and then the delivery line.

Tightening Specifications